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Step 9Fixing skews and twists
Check each corner for squareness. Attaching the tray floor in Step 10 will correct minor skews, but if a mild push won't square up a corner, loosen the screws and insert a shim piece vertically in the outer or inner side of the joint. A dab of glue will help keep the shim in place.
The tray may take on a twist during assembly, resisting all efforts to make it lie flat -- and lying flat is an important feature for a shallow tray holding water. The twist can arise from slightly non-straight wood, from ends cut slightly non-square, or from joints not quite aligned by screws.
At the two diagonal corners that are too high, loosen the top screws and remove the bottom screws. As you hold the frame flat, slide builder's shims into the wide ends of any gaps. Drill a body hole through the shim, to reduce splitting, and reinstall the bottom screws. Tighten the screws; the frame should now lie substantially flat. Saw the shims flush, or score them and break off the excess.
The tray may take on a twist during assembly, resisting all efforts to make it lie flat -- and lying flat is an important feature for a shallow tray holding water. The twist can arise from slightly non-straight wood, from ends cut slightly non-square, or from joints not quite aligned by screws.
At the two diagonal corners that are too high, loosen the top screws and remove the bottom screws. As you hold the frame flat, slide builder's shims into the wide ends of any gaps. Drill a body hole through the shim, to reduce splitting, and reinstall the bottom screws. Tighten the screws; the frame should now lie substantially flat. Saw the shims flush, or score them and break off the excess.
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